Rtech ProArc 135 User manual

www.r-techwelding.co.uk
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ProArc 135
INVERTER ARC WELDER
OPERATION INSTRUCTIONS
Version 2014-1

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Thank you for selecting the R-Tech PROARC135 Inverter Arc Welder
The PROARC135 has many benefits over traditional transformer arc welders, including
infinite power control, anti stick and hot start technology to aid easy arc starting and the
inverter power source provides smooth weld characteristics
We want you to take pride in operating our PROARC135 as much pride as we have taken in
making this product for you. Please read all information in this manual before operation
PLEASE EXAMINE CARTON AND EQUIPMENT FOR DAMAGE IMMEDIATELY
When this equipment is shipped, title passes to the purchaser upon receipt from the courier.
Consequently all claims for material damaged in shipment must be made by purchaser against the
transportation company used.
Please record your equipment identification below for future reference. This information can be found on
data plate at rear of machine.
Product PROARC135
Serial No. ___________________________________
Date of Purchase _____________________________
Where Purchased _____________________________
Whenever you request replacement parts or information on this equipment please always supply
information you have recorded above
This product is covered by our 2 year collect and return UK warranty, External items, torch, earth lead
etc are covered by 3 months warranty. Any faults/damage found caused by customer will be charged
pro-rata.
Please read this operator manual completely before attempting to use this equipment.
Pay particular attention to the safety instructions we have provided you for your protection
The level of seriousness to be applied to each section is explained below
WARNING
This statement appears where the information must be followed exactly to avoid serious personal
injury.
CAUTION
This statement appears where the information must be following to avoid a minor personal injury or
damage to this equipment.

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The R-Tech PROARC135 is a member of our field acclaimed family of welding products.
Premium features include:-
1. Inverter power source – more efficient to operate, provides smoother weld characteristics.
2. Infinite welding power adjustment to allow fine tuning of weld characteristics
3. Automatic hot start – enables easy arc starting
4. Automatic anti-stick – stops rods from sticking to work
5. Portable and lightweight, ideal for mobile and maintenance welding
6. 35% Duty cycle at 135 Amps @ 40ºC
Recommended Processes
The R-Tech PROARC135 is recommended for the MMA welding processes within its output
capacity of 135 Amps DC
Equipment Limitations
The R-Tech PROARC135 is protected from overloads beyond the output ratings and duty cycle as
per machine specifications with thermostat protection.
Welding Capability – Duty Cycle
The R-Tech PROARC135 is rated at 135 Amps at 35% duty cycle on a ten minute basis. If the duty
cycle is exceeded a thermal protector will shut machine off until the machine cools.
Technical Specifications
Model No.
R-Tech PROARC135
Input
240V AC 50/60Hz
16A
MMA
No-load Voltage
80V
Current Range
15A – 135A
Rated Output Current
135A
Duty Cycle
35%
Gross Weight
5.8 KG
Insulation
IP21S
Dimensions mm
320 x 130 x 240

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Safety Precautions
Read entire section before starting installation
WARNING!
Electric Shock can kill – Only qualified personnel should perform this installation. Turn off input
power at the fuse box before working on this equipment. Do not touch electrically live parts. Always
connect the machine to an earthed mains supply as per national recommended standards.
Select suitable location
Place the welder where clean cooling air can freely circulate in and out of the front & rear vents.
Dirt, dust or any foreign material that can be drawn through vents into welder must be kept to a
minimum. Failure to observe these precautions can result in excessive operating temperatures
which can lead to plant failure.
Grinding
Do not direct grinding particles towards the welder. An abundance of conductive material can cause
plant failure.
Stacking
This machine cannot be stacked.
Transport – Unloading
Never underestimate the weight of equipment, never move or leave suspended in the air above
people. Use recommended lifting equipment at all times.
WARNING!
Falling Equipment can cause injury. Never lift welder with gas bottle attached. Never lift above
personnel.
Tilting
Machine must be placed on a secure level surface or on a recommended undercarriage/trolley.
This machine may topple over if this procedure is not followed.
Environmental Rating
The welding power source carries the IP21S rating. It may be used in normal industrial and
commercial environments. Avoid using in areas where water / rain is around.
Read and follow the ‘Electric Shock Warnings’ in the safety section if welding must be performed
under electrically hazardous conditions such as welding in wet areas or water on the work piece.

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Machine grounding and Interference Protection
This welder must be grounded to earth. See national electrical codes for proper grounding
methods.
Radiated interference can develop in the following ways
1. Direct interference from welder power source
2. Direct interference from the welding leads
3. Direct interference radiated from feedback into power lines
4. Interference from re-radiation by un-grounded metallic objects.
Keeping these contributing factors in mind, installing equipment as per following instructions should
minimize problems.
1. Keep the welder input power lines as short as possible and enclose as much of them as
possible in metal conduit or equivalent shielding. There should be a good electrical contact
between this conduit and ground (Earth).
2. Keep the work and electrode leads as short as possible. Length should not exceed 25FT.
Tape the leads together where practical.
3. Be sure the torch and earth leads rubber coverings are free from cuts and cracks that allow
high frequency leakage
4. Keep the torch in good repair and all connections tight to reduce leakage
5. Keep earth lead connection to work in good condition – Clean area on workbench where
earth clamp is situated on a regular basis.
Input Connections
Make sure the voltage, phase and frequency of input power is as specified on machine rating plate
located at rear of machine.
Have a qualified electrician provide suitable input power as per national electrical codes. Make sure
machine is earthed / grounded.
Make sure fuse or circuit breaker is correct rating for machine. Using fuses or circuit breakers
smaller than recommended will result in ‘nuisance’ shut off from welder inrush currents even if
welding at low amperages.
On multiple voltage input welders, be sure the machine is connected as per the instructions for the
voltage being supplied to welder – Failure to follow these instructions can cause immediate failure
within the welder and void machines warranty.
WARNING!
ELECTRIC SHOCK CAN KILL
Turn the input power OFF at the mains switch & fuse box before working on this equipment.
Have a qualified electrician install & service this equipment.

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Allow machine to sit for 5 minutes minimum to allow the power capacitors to discharge before
working inside this equipment.
Do not touch electrically live parts
The PROARC135 Inverter Welder requires a 240V 16A 50/60Hz supply (at 125 amps output it will
draw 13A input, if used on a 13Amp plug you may get nuisance fuse blows when welding at
maximum amperage). It comes with a 2 metre mains cable attached.
Connect wires according to national coding.
Brown wire – Live
Blue wire – Neutral
Green/Yellow Wire – Earth (Ground)
Front machine connections
Fig 1
1. Negative welding power connector
Connect the earth cable dinse plug into here and twist to secure
2. Positive welding power connector
Connect the electrode holder cable dinse plug into here and twist to secure
Most popular rods require positive welding electrode and negative earth. If you are using special
electrodes please check manufacturer’s recommendation for correct polarity of welding electrodes
and connect as required.

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Rear machine connections
Fig 2
1. On / Off Switch
This switches machine on /off
2. Mains input cable
Connect electrical plug as required

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Controls and Settings
1. Current Control Knob
This selects the welding power and is shown in LED display (3)
2. Warning indicator light
Lights RED when over-heat thermostat protection has occurred, due to over work or poor
airflow. Fan will continue to run and once machine has cooled down light will go off and
machine is ready to use.
Note: This light will come on for 1-2 seconds when first turned on and then will go off once
start up self test has finished.
3. Display LED
This LED shows the selected welding current.

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Operating machine
SAFETY PRECAUTIONS
WARNING!
ELECTRIC SHOCK CAN KILL
Do not touch electrically live parts or electrode with skin or wet clothing.
Insulate yourself from work and ground
Always wear dry insulating gloves
WARNING!
FUMES AND GASES can be dangerous
Keep your head out of fumes & gases produced from welding.
Use ventilation or exhaust to remove fumes & gases from breathing zone and general area.
WARNING!
WELDING SPARKS can cause fire or explosion
Keep flammable material away from work area.
Do not weld on containers that have held combustibles
WARNING!
ARC RAYS can burn
Wear eye, ear and body protection – Make sure work area is protected by proper shielding to
avoid injury to passers by.

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Operating Machine
1. Ensure machine is setup as previously stated
2. Fit desired electrode size in electrode holder
3. Switch on machine
4. Select desired welding power
5. Touch electrode on to workpiece and arc will start
When machine is switched on, output terminals are always live, take care and do not touch
electrode and earth by person at same time, otherwise electric shock will occur.
WARNING!
ELECTRIC SHOCK CAN KILL
Maintenance
Routine and periodic maintenance
WARNING!
ELECTRIC SHOCK CAN KILL
Turn the input power OFF at the mains switch & fuse box before working on this equipment.
Have a qualified electrician install & service this arc welding equipment.
Allow machine to sit for 5 minutes minimum to allow the power capacitors to discharge before
working inside this equipment.
Do not touch electrically live parts
1. Periodically remove the side/top panels of machine and clean out machine with a low
pressure dry air line paying particular attention to PC Boards, Fan blades
2. Inspect input and output cables & hoses for fraying, cuts & bare spots
3. Keep torch and cables in good condition
4. Clean air vents to ensure proper air flow and cooling
5. The fan motor has sealed bearings which requires no maintenance

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Troubleshooting
Service & repair should only be performed by R-Tech welding trained personnel. Unauthorised
repairs performed on this equipment may result in danger or injury to the technician and machine
operator and will invalidate your warranty.
For your safety and to avoid electric shock, please observe all safety notes and precautions
detailed throughout this manual
The troubleshooting guide is provided to help you locate possible machine malfunctions
If fault / problem is not listed below check please check our ARC Welder Support page on our
website.
www.r-techwelding.co.uk/support.php
or contact R-Tech by phone. Contact details can be found on our website
Output Problems
1. No output - LED display is not lit
Check machine on/off switch is in the ‘on’ position
Check Input power to machine
Check plug wiring
Check mains trip / fuses
2. No output - Fan runs – LED display is lit – Warning light is NOT lit
Check welding cable connections are secure and earth lead is in good condition, replace
cables if damaged
3. No output – LED display is lit - Warning light is lit
Welding application may have exceeded recommended duty cycle, allow machine to cool
down until the warning light goes out.
4. Machine keeps overheating - Warning light is lit on machine
Check if fan is running – if not contact R-Tech for repair
Check the cooling vents for obstruction, blow out machine with clean dry low pressure air
supply.
Check for adequate ventilation around machine
5. Poor weld penetration
Check condition of earth lead and clamp and ensure clamp is connected via a clean area
on work piece

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Arc welding problems
1. Stick electrode ‘blasts off’ when arc is struck
Welding current set too high, reduce welding current
Materials are dirty – clean before welding
2. Excessive Splatter
Long arc – get electrode closer to work
Welding current too high, reduce welding current
3. Insufficient penetration
Too fast welding speed, slow down travel speed
Welding current set too low, increase welding power
4. Porosity in weld
Humidity in electrodes
Long arc – get electrode closer to work

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